Diophantine properties of fixed points of Minkowski question mark function

2018/11/26 by Dmitry Gayfulin, Gayfulin, Dmitry, Nikita Shulga +1
Mathematics · #FOS: Mathematics #Number Theory (math.NT) #math.NT

paper · pdf · doi:10.48550/arxiv.1811.10139

12 pages

arxiv created 2019/06/25 · arxiv updated 2019/06/26

Abstract

We consider irrational fixed points of the Minkowski question mark function ? (x), that is irrational solutions of the equation ? (x)=x. It is easy to see that there exist at least two such points. Although it is not known if there are other fixed points, we prove that the smallest and the greatest fixed points have irrationality measure exponent equal to 2. We give more precise results about the approximation properties of these fixed points. Moreover, in Appendix we introduce a condition from which it follows that there are only two irrational fixed points.

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